CN2399900Y

CN2399900Y - Fluorescent lamp electronic ballast

Info

Publication number: CN2399900Y
Application number: CN 99222157
Authority: CN
Inventors: 吴峰
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-08-28
Filing date: 1999-08-28
Publication date: 2000-10-04
Anticipated expiration: 2009-08-28

Abstract

The utility model relates to a fluorescent lamp electronic ballast, which ix composed of the mutual connection of an adjustable capacitance ballast, a bridge rectifier, a voltage doubling rectifier and a voltage-controlled adjustor, wherein, the bridge rectifier and the voltage doubling rectifier output high voltage and implement cold starting to a fluorescent lamp tube; the adjustable capacitance ballast play the ballast role; the capacity of the adjustable capacitance ballast is controlled by the voltage-controlled adjustor. Consequently, the working voltage range of the fluorescent lamp is enlarged. The fluorescent lamp electronic ballast can effectively prolong the lifetime of the lamp tube, and can not influence use even if the lamp filaments are burn out. The utility model has the notable advantages of good starting performance, no strobe, no noise, no interference, energy saving, low consumption, reliable work, long lifetime, etc.

Description

A kind of electronic ballast for fluorescent lamp

The utility model belongs to electricity field, specifically a kind of fluorescent lamp ballast.

As everyone knows, at present fluorescent lamp adopts fixed inductance formula ballast more, and is provided with supporting starter, and major defect is: 1. starter failure rate height; 2. start difficulty when supply voltage is on the low side, lights one less importantly to repeatedly starting repeatedly reluctantly, this will influence lamp tube service life; 3. when supply voltage was higher, the actual power of fluorescent tube surpassed rated power, also will influence lamp tube service life.

The purpose of this utility model is to provide a kind of electronic installation of cold start fluorescent tube, and the fixing ballast mode of changing is the variable ballast mode that is subjected to supply voltage control, all can operate as normal when supply voltage is on the low side or higher to guarantee fluorescent lamp.

For reaching above-mentioned purpose, feature of the present utility model is: the tunable capacitor ballast is connected with the input of voltage-controlled adjuster again and is connected AC power with bridge rectifier, the output termination tunable capacitor ballast of voltage-controlled adjuster, the output termination voltage-doubler rectifier of bridge rectifier, the output termination fluorescent tube of voltage-doubler rectifier.After AC power was connected, the pulse of voltage-doubler rectifier output HIGH voltage was implemented cold start to fluorescent tube, and the tunable capacitor ballast plays the ballast effect, and its amount of capacity is controlled by voltage-controlled adjuster, guaranteed that supply voltage fluorescent lamp on the low side or higher all can operate as normal.

The utility model is also realized by following measure: the tunable capacitor ballast be by a fixed capacitor be composed in series with another fixed capacitor again after electronic switch is in parallel, control electronic switch " lead to " and " breaking " can regulate the size of electric ballast total capacity.

Voltage-controlled adjuster is to be connected and composed successively by voltage detecting circuit, photoelectrical coupler, Schmidt trigger and electronic switch, voltage detecting circuit is to be composed in series by rectifier diode, sample resistance and adjustment resistance, the two ends of series circuit are the input of voltage-controlled adjuster, the two ends of sample resistance are in parallel with the input of photoelectrical coupler, the input of the output termination Schmidt trigger of photoelectrical coupler, its output termination electronic switch.

The utility model is owing to adopted the capacity of voltage sensor control technology control capacittance ballast, no matter make supply voltage on the low side or higher, fluorescent lamp is the energy operate as normal all, enlarged the operating voltage range of fluorescent lamp, prolonged lamp tube service life, even filament blow does not influence use yet, have remarkable advantages such as good, the no stroboscopic of startability, noiselessness, noiseless, energy-conservation, low consumption, reliable operation, long service life.

Below in conjunction with accompanying drawing, the utility model is described in detail by embodiment.

Fig. 1, the utility model calcspar.

Fig. 2, the utility model circuit theory diagrams.

Mark among the figure: capacitor C1 ^-C5, resistance R 1 ^-R8, inductor L, diode D1 ^-D10, photoelectrical coupler IC1, not gate F1, F2, F3, one-way SCR CR.

Embodiment:

Illustrated in figures 1 and 2, fixed capacitor C3 is with diode D7 ^-The electronic switch series connection back that D10 and one-way SCR are formed is in parallel with capacitor C2, forms the tunable capacitor ballast, tunable capacitor ballast and diode D3 ^-Connect AC power after the bridge rectifier series connection that D6 forms, rectifier diode D1, sample resistance R1 and adjustment resistance R 2 series connection AC power, not gate F1, F2 and resistance R 4 are connected into Schmidt trigger, the input of photoelectrical coupler IC is in parallel with R1, the following termination R3 of its output and the input of Schmidt trigger, the power positive end of last termination ungated integrated circuit, the power supply negative terminal of another termination ungated integrated circuit of R3, the power end shunt capacitance C1 of ungated integrated circuit, negative terminal meets D7 ^-The negative terminal of D10 bridge rectifier, anode connects the upper end of AC power by resistance R 5 and diode D2, the input of the output termination not gate F3 of Schmidt trigger, the output termination R6 of F3, trigger electrode and the resistance R 7 of another termination controllable silicon of R6 CR, the power supply negative terminal of another termination ungated integrated circuit of R7.The output of capacitor C 4 and C5 series connection bridge rectifier, intermediate contact connects the lower end of AC power, capacitor C 4 and C5 and bridge rectifier diode capacitor C2 form voltage-doubler rectifier, and the upper end of C4 connects the upper end of fluorescent tube through inductor L, and the lower end of C5 connects the lower end of fluorescent tube through resistance R 8.

After the utility model is connected AC power, when being in positive half cycle, AC power (establishes power supply upper end for just, the lower end is for negative) time, capacitor C 2 is recharged, and polarity of voltage is that the positive lower plate of upper plate is negative, and (the power supply lower end is for just when power supply is in negative half period, the upper end is for negative) time, the charging voltage of supply voltage and C3 superposition is mutually charged to C4, obtains multiplication of voltage at C4, and polarity is that the positive lower plate of upper plate is negative; In like manner, at the negative half period of power supply C2 is charged, polarity of voltage is that the positive upper plate of lower plate is negative, the charging voltage of the positive half cycle supply voltage of power supply and C2 mutually superposition C5 is charged, in the multiplication of voltage that is obtaining on the C5 bearing just down.This high voltage pulse that multiplication of voltage on capacitor C 4 and the C5 is in series is enough to and can starts fluorescent lamp under cold conditions, and internal resistance reduces after the fluorescent tube conducting, and operating current increases, and makes the terminal voltage V of the voltage-doubler rectifier capacitor C2 that descends automatically play metering function.

When supply voltage is on the low side, the voltage at sample resistance R1 two ends can not be lighted the luminous tube of photoelectrical coupler input, the output high resistant, and the input end of Schmidt trigger is exported electronegative potential in electronegative potential, F3 is inverted into high potential through not gate, trigger controllable silicon CR, make the electronic switch conducting, C3 is by the electronic switch short circuit, the capacity of tunable capacitor ballast is the capacity of C2, be maximum, the metering function minimum has guaranteed fluorescent lamp operate as normal under low-voltage.

When supply voltage is higher, the voltage at sample resistance R1 two ends can be lighted the luminous tube of photoelectrical coupler input, the output low-resistance, and this moment, the input end of Schmidt trigger was exported high potential in high potential, F3 is inverted into electronegative potential through not gate, controllable silicon CR can not be triggered, and electronic switch is turn-offed, and C3 and C2 form series circuit, the total capacity of tunable capacitor ballast reduces, metering function increases, and has guaranteed that supply voltage is higher, and fluorescent lamp also can operate as normal.

Claims

1, a kind of electronic ballast for fluorescent lamp, be provided with the tunable capacitor ballast, it is characterized in that the tunable capacitor ballast connects with bridge rectifier, again with voltage-controlled adjuster input and connect AC power, the output termination tunable capacitor ballast of voltage-controlled adjuster, the output termination voltage-doubler rectifier of bridge rectifier, the output termination fluorescent tube of voltage-doubler rectifier is after AC power is connected, the pulse of voltage-doubler rectifier output HIGH voltage, fluorescent tube is implemented cold start, and the tunable capacitor ballast plays the ballast effect, and its amount of capacity is controlled by voltage-controlled adjuster, when guaranteeing that supply voltage is on the low side or higher, fluorescent lamp all can operate as normal.

2, a kind of electronic ballast for fluorescent lamp according to claim 1, it is characterized in that described tunable capacitor ballast, be with after electronic switch is in parallel by a fixed capacitor, be composed in series with another fixed capacitor again, " leading to " and " breaking " of control electronic switch, the size of energy control capacittance ballast total capacity.

3, a kind of electronic ballast for fluorescent lamp according to claim 1, it is characterized in that described voltage-controlled adjuster is to be connected and composed successively by voltage detecting circuit, photoelectrical coupler, Schmidt trigger and electronic switch, voltage detecting circuit is to be composed in series by rectifier diode, sample resistance and adjustment resistance, the two ends of series circuit are the input of voltage-controlled adjuster, the two ends of sample resistance are in parallel with the input of photoelectrical coupler, the input of the output termination Schmidt trigger of photoelectrical coupler, its output termination electronic switch.